Merge pull request pandas-dev#5941 from jreback/gbq

API: add read_gbq to top-level api, closes (GH5843)

Author: jreback

pandas/io/api.py

@@ -12,3 +12,4 @@
 from pandas.io.stata import read_stata
 from pandas.io.pickle import read_pickle, to_pickle
 from pandas.io.packers import read_msgpack, to_msgpack
+from pandas.io.gbq import read_gbq

pandas/io/gbq.py

@@ -13,8 +13,9 @@
 import pandas as pd
 import numpy as np
 
-from pandas import DataFrame, concat
 from pandas.core.common import PandasError
+from pandas.core.frame import DataFrame
+from pandas.tools.merge import concat
 
 try:
     import bq